Malicious PDF — malware analysis report

Static analysis result for SHA-256 42acc10259f6ccfc…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c733d2e988bbdb92040996233bb760b SHA-1: d7d63199bdd7897267ab310d0e4d15789da4570e SHA-256: 42acc10259f6ccfcb2be93f18bda9821b508886335540ced5f152035fb28bd31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=spring+microservices+in+action+second+edition+pdf PDF link annotation
    • http://youngshiny.com/userfiles/file/1621962322.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/33248803582.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160709b3feca01---ganujofusuluxopuvavatim.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/o3a051snma61svochri2bncq94/lapevinenaf.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bimosis.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160945150aa5ed---40356226082.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nunip.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b0acdeba---94228415911.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/ruxofitoxapagatex.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/41797775795.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mubelodiseb.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7b40dc2a---27467281942.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8309b8d824---42830114056.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a7bb8ab04165626fce3c4e94455ae713/65392040758.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dorukubapovirumuwo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/tokux.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160740f025ac18---zurorometorepedutiz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607604d0ad1f4---83335096048.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/tegezikibewewu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/vibineruvajokevikunimowug.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210628225719.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/36112905152.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdf2b04be---28404233362.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 17400 bytes
SHA-256: 8804ca2b8e80a2c549b84f730d7d8b8b1795b0079054ec11b01c89555bde4120
font_01_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 11060 bytes
SHA-256: 9855293af9bc2fec7f5c1a1d2444d314fddd3f4c3aa3876207cfb2a75526e1f8

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